[media] OMAP_VOUT: Fix VSYNC IRQ handling in omap_vout_isr

Currently, in omap_vout_isr(), if the panel type is DPI, and if we
get either VSYNC or VSYNC2 interrupts, we proceed ahead to set the
current buffers state to VIDEOBUF_DONE and prepare to display the
next frame in the queue.

On OMAP4, because we have 2 LCD managers, the panel type itself is not
sufficient to tell if we have received the correct irq, i.e, we shouldn't
proceed ahead if we get a VSYNC interrupt for LCD2 manager, or a VSYNC2
interrupt for LCD manager.

Fix this by correlating LCD manager to VSYNC interrupt and LCD2 manager
to VSYNC2 interrupt.
Signed-off-by: Archit Taneja <archit@ti.com>
Reviewed-by: Sumit Semwal <sumit.semwal@ti.com>
Acked-by: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/omap/omap_vout.c

@@ -565,8 +565,8 @@ static int omapvid_handle_interlace_display(struct omap_vout_device *vout,
 
 static void omap_vout_isr(void *arg, unsigned int irqstatus)
 {
-	int ret, fid;
-	u32 addr;
+	int ret, fid, mgr_id;
+	u32 addr, irq;
 	struct omap_overlay *ovl;
 	struct timeval timevalue;
 	struct omapvideo_info *ovid;
@@ -582,6 +582,7 @@ static void omap_vout_isr(void *arg, unsigned int irqstatus)
 	if (!ovl->manager || !ovl->manager->device)
 		return;
 
+	mgr_id = ovl->manager->id;
 	cur_display = ovl->manager->device;
 
 	spin_lock(&vout->vbq_lock);
@@ -589,7 +590,14 @@ static void omap_vout_isr(void *arg, unsigned int irqstatus)
 
 	switch (cur_display->type) {
 	case OMAP_DISPLAY_TYPE_DPI:
-		if (!(irqstatus & (DISPC_IRQ_VSYNC | DISPC_IRQ_VSYNC2)))
+		if (mgr_id == OMAP_DSS_CHANNEL_LCD)
+			irq = DISPC_IRQ_VSYNC;
+		else if (mgr_id == OMAP_DSS_CHANNEL_LCD2)
+			irq = DISPC_IRQ_VSYNC2;
+		else
+			goto vout_isr_err;
+
+		if (!(irqstatus & irq))
 			goto vout_isr_err;
 		break;
 	case OMAP_DISPLAY_TYPE_VENC: